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Outline
To address the issue of low blasting efficiency in deep buried roadways excavation, the influence of detonation sequence under high stress conditions on the blasting effectiveness of parallel cut was studied. By combining physical model tests with numerical simulations, the dynamic laws of strain field evolution, crack expansion, and groove cavity formation with different detonation sequences were revealed. The metal wire electric explosion technology was used to simulate explosive blasting, combined with a confining pressure loading device to apply static pressure. The digital image correlation method (DIC) and ultra-high-speed camera were used to capture the surface strain field and crack expansion process of the specimens. Based on the 3D scanning results, the differences in groove shape with different detonation sequences were analyzed. The results show that when the first blast hole is located in the direction of the maximum principal stress (detonation sequence two), the circumferential strain of the empty hole is significantly increased, and it is easy to form penetrating cracks. The 3D scanning results show that the groove cavity volume of detonation sequence two is larger than that of detonation sequence one, and the residual rate at the bottom of the hole is reduced. Numerical simulation further verifies that when the first blast hole is along the direction of maximum principal stress, the distribution of damage zone is more uniform, the opening angle of the groove cavity increases, and the energy utilization efficiency of subsequent blast holes is effectively improved. The research has shown that prioritizing detonation in the direction of maximum principal stress can optimize the distribution of damage zones, improve the shape of the groove cavity, and reduce residue at the bottom of the hole.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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